Henman added: "The round-robin format allows for a little margin for error but everybody will want to get off to a good start so the first match will be important as it will set the tone for the remainder of the week.

"I haven't played Marat for a couple of years but he's obviously the man to beat at the moment and my only match against Guillermo this year was at the French Open, which was pretty close.

"I think the event itself is wide open so everybody will fancy their chances - me included.

"If I can get off to a good start and execute my gameplan to the best of my ability I think I can cause a few problems and that's certainly what I'll be trying to do," he told his website www.timhenman.org